Dust-collector.



C. R. THURMAN.

DUST GOLLEGTOR.

APPLICATION FILED MAY 23, 1912.

1,043,551 Patented Nov.5, 1912.

2 SHEETS-SHEET 1.

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G. R. THURMAN.

DUST COLLECTOR.

APPLICATION FILED MAY 23, 1912.

2 SHEETS-SHEET 2.,

UNITED, STATES PATENT OFFICE.

cnAma-is' n'rnUnmAN, or rrrrssu'nen, PENNSYLVANIA, ASSIGNOR 'ro ELECTRIC .LRENOVATOR MANUFACTURING COMPANY, OF

coRroBArIoN or rnNNs'r'LvANrA.

DUST-COLLECTOR.

To allwhomit may concern;

Be-it known-that I, CHARLES R. THUR-.

MAN, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of;.,=l ennsylvania,have invented new and useful-Improvements in Dust-Collectors, .of which thefollowi'ng is a specifica-' tion. l I

This invention relates to dust collectors for use with pneumatic cleaning systems particularly such" as operate and machines,

, by vacuum or suction.

The object of'the-invention is to provide a receptacle of suitable form and dimensions into which dust laden air' is drawn tangentially to give it a whirling motion and thus set up a centrifugal separation of the heavier parts of the dust and dirt from the air. Leavin the receptacle through a suitable outlet, t e air traverses a screen of tex+ tile material and'is thoroughly strained, the dust remaining more or less-on the wall of T the screen from which it is removed by causmg a current of air to pass through the screen in a reverse direction. To accomplish this, the screen is preferably made in the suitable connection 13 into a reservoir, not

form of a cylinder and rotated slowly past a suitably arranged inlet communicating with the atmosphere. As the screen slowly traverses this inlet, the'suction of the appa ratus draws the outer air inwardly through the same which then passes through the screen from without and blows the dust from its inner side.

' With this as the principal object, the in-" vention consists of the novel construction,

combination and arrangement of parts hereinafter described in detail, setforth in the .or tank, preferably cylindrical in shape, provided w1th a tightly fitting but removable closure 11 at the top, and aconical bottom 12 to direct dirt and dust through a Specification of Letters Patent.

' Application filed Kay 23, 1912. Serial No. 699,355.

provided with a stu Patented Nov. 5, 1912.

shown, where it collects until such time as is PITTSBURGH, IPENNSYLVANIA, A

convenient for emptying. Dust laden air is drawn by suction into the tank through an lnlet 14 connected at a tangent to the tank wherebythe air is given a whirling motion within the tank which tends to assist the separation of the dirt and dust by centrifugal force. 7 0 s In the-longitudinal center of the tank 10 is a shaft 15 carried in bearings 16 and 17, the bearing 16 bein on the closure 11 and ng gland 18 to prevent air entering around the shaft. The bearing 17 is supported by arms 19 radiating toward and connected 'toa'ring 20 fastened to the wall of the tank, a suitable distance'below the top of the tank. Attached to the shaft near the respective bearings are two equal spiders 21 and 22 with annular peripheries,

slightly less in diametenthamthe tank, bea tween which spiders is stretched a cylindrical screen 23 oftextile material. of such character as will permit. air to pass through with little or-noimpediment, but will form a perfect barrier to the even the finest. The cylindrical screen 23 is open at the bottom to permit air to be purified entering the same, but is closed at its top by a preferably imperviOussheet 35 so passage of all dust,

that all outgolng air must'pass through the screen wall. The screen 23 may be fastened to the spiders in any desired manner, but in the present instance thespiders are shown each with a peripheral groove into which a fastening cord or wire 24 binds the ends of the cylindrical screen. The lower end 25 of the screen projects a short distance below the spider 22" and overlaps. the ring 20 against which it is held by the air pressure to prevent the escape. or leakage of dirt laden air around the edge ofthe screen. 1

Connected to the tank 10 at a suitable point opposite the screen 23 is an outlet pipe 34 for air free of dust leading to the suction apparatus of any well known type, not shown.

The upper end of the shaft. 15 projecting through the gland 18 has attached to it, 1n

the present instance, a worm wheel 26 driven by a worm 27 on the shaft-of a small electric motor 28 fastened on the closure 11. By

this means the screen required speed.

Within the casing .or tank 10 close to or in 23 is rotated at, the

. contact with the outer surface of thescreen cloth 23 is a pipe 29 extending parallel with the wall of the tank into the atmosphere or the admission of air which escapes from the pipe through a narrow slot 31 formed therein from end to end on the side next the screen. Projecting laterally fromeach side of the pipe throughout the length of the slot 31 is a wing or shield 32, against which wings the screen cloth is forced'by the air pressure and passage of air outwardly through such portion of the screen temporarily interrupted. The suction within the tank however draws air in through the ends 30 of the pipe 29 and through the slot 31 which flows in reverse direction through the screen and blows the dust from the inside thereof. The amount of inflowing air may be regulated by the width of the slot 31, or air valves 33 may be attached to the ends 30 of the pipe 29. v

In operation, the outlet 34 is connected to a suction apparatus and a partial vacuum created in the tank or reservoir '10. Dust laden air is drawn through the inlet 14 into the tank at a tangent and whirls about therein. Rising upwardly within the screen, the air passes through the same to the outlet 34, leaving the dust and dirt-on the in side of the screen wall. The rotation of the screenbrings every part of it successively across. the air pipe 29 and the wings or shields 32 momentarily stopping the flow of air outwardly through the part of the screen overlying the wings. That portion of the screen in front of the slot 31 in the pipe 29 is subjected to a current-of air fromthe pipe flowing in a reverse direction, that is, from without inward, the effect of which is to blow the dust from the inside of the screen so that it will fall to the bottom of the tank 10 and thence into the reservoir below. It will .be understood that during operation there is always a partial vacuum 1n the tank and naturally a current of air will flow inward through the pipe 29. The

shields or wings 32 are extended on both sides of the pipe 29 to stop the outflow of air through the, screen adjacent the pi e, which if permitted would, by continually tiepositin dust on the screen within the influence o the inflowing air, counteract the cleaning operation of said inflowing air.

WhatI claim is: p 4

1. A dust collector comprising a easing into which a current of dust laden air is directed, a screen in said casing through which all of said air passes in one direction to strain the dust therefrom, means for .momentarily cutting oif the passage of 7 screened air through a limited portion. of

said screen, and means for directing at the same time a stream of fresh air from without the casing through said limited portion of the screen in reverse direction to clean the same from accumulated dust.

2. A dust collector comprising a casing through which a current of dustladen air is directed, a rotatable screen in said casing through which said air passes in one direction to strain it from dust, means adjacent said screen adapted to momentarily check the flow of air through successive limited port-ions of the screen as it rotates, and means for directing a streamof fresh air generated by the current flowing through the casing to pass in reverse direction through that portion of the screen covered by the .checking means to clean the dust from the screen.

3. A dust collector comprising a casing through which a current of dust laden air i directed, a rotatable screen in said casing through which said air passes in one direction to strain it from dust, a shield in the casing frictionally in contact with the screen to check the flow of air through that portion of the screen bearing in its'rptation against the shield, andmeans for directing a stream of fresh air generated by the current flowing: through the casing to pass in reverse direction through the portion of the screen out OR by said shield to remove the dust therefrom.

4. A dust collector comprisin a casing through which a current of dust aden air is directed, a rotatable sereen in said casing through which said airipasses in one direc tion to strain it from dust, a shield in the casing frictionally in contact with the screen to check the flow of air through that portion of the screen bearing in its rotation against the shield, and means for causing a stream of fresh air to be drawn by suction through the screen' in reverse direction lhrou h the portion of the screen out ofi by said s ield to remove the dust therefrom.

5. A dust collector comprising a casing through which a current of dust laden airis directed, a rotatable screen in said casr verse direction through-the screen while the screening current is cut off by the shield.

6'. A dust collector comprisinga casin into and through which a current of dust aden air passes tangentially, a cylindrical screen mounted therein and adapted to rotate and throughwhich said air passes in one direc- 11011 to strain it from dust, a shield in sai'l,

casing extending lon itudlnally thereof in contact with a hmite portion of the screen weasel to prevent the'passage of air through the screen while in contact with the shield, and a pipe extending. longitudinally of said shield 0 ening into the atmosphere at its ends an having a longitudinal slot bearing on the screen through which a current of fresh air passes to and'through the screen in reverse direction to the current to be strained for cleaning the dust from the screen.

7. A dust collector comprising a casing through which a current of dust laden air is directed, a screen in said casing through which said air passes in one direction to strain it from dust, an orifice in said casing, means for causing a stream of fresh air to flow from said orifice through said screen in a reverse direction to that of the dust laden air, and means for bringing all parts of the screen successively within the range or action of said stream of fresh air to remove the dust therefrom.

8. In a dust collector containing a rotating cylindrical screen for straining dust from air drawn through the screen by suction, of means for momentarily interrupting the passage of dust-laden air to a limited portion or said screen and direct at the same time a current of fresh air against said limited portion of the screen in a reverse direction for removing the dust therefrom, said means comprising a pipe provided with t longitudinal slot and bearing against said screen and communicating at its ends with the atmosphere, a valve on each end of said pipe, and a lateral projection on the pipe on each side of said slot in contact with the screen.

In testimony whereof I have hereunto set my hanu in presence of two subscribing witnesses.

CHARLES R. THURMAN.

Witnesses:

MAX H. Saonovrrz, HARRIET R. PURVIS.

Copies oi this patent may be obtained for five cents each,

by addressing the Commissioner of iatcnta,

Washington, D. C. 

